STA381BWS datasheet(159/174 Pages) STMICROELECTRONICS

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STA381BWS

The above thresholds and hysteresis table can be overridden and the low-level threshold

and high-level threshold can be set by the MTH[21:0] bits.

To activate the manual thresholds the FINETH bit has to be set to ‘1’.

To configure the low threshold, the WTHL bit must be set to ‘1’ so that any write operation to

the MTH bits will set the low threshold.

To configure the low threshold, the WTHH bit must be set to ‘1’ so that any write operation to

the MTH bits will set the low threshold.

If the zero-mute block does not detect mute, it will mute the output when the current RMS

value falls below the low threshold.

If the zero-mute block does not detect mute, it will unmute the output when the current RMS

value rises above the high threshold.

Table 172. Zero-detect threshold

ZMTH[2:0]

Equivalent input level (dB)

000

-78

001

-84

010

-90

011

-96

100

-102

101

-108

110

-114

111

-114

Table 173. Zero-detect hysteresis

HSEL[1:0]

Equivalent input level hysteresis (dB)

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- Obsolete

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